Greg Fodor created KAFKA-3745:
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Summary: Consider adding join key to ValueJoiner interface
Key: KAFKA-3745
URL: https://issues.apache.org/jira/browse/KAFKA-3745
Project: Kafka
Issue Type: Improvement
Components: streams
Affects Versions: 0.10.0.0
Reporter: Greg Fodor
Assignee: Guozhang Wang
Priority: Minor
In working with Kafka Stream joining, it's sometimes the case that a join key
is not actually present in the values of the joins themselves (if, for example,
a previous transform generated an ephemeral join key.) In such cases, the
actual key of the join is not available in the ValueJoiner implementation to be
used to construct the final joined value. This can be worked around by
explicitly threading the join key into the value if needed, but it seems like
extending the interface to pass the join key along as well would be helpful.
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